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Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop
Alternative TitleChem. Eng. Sci.
Li, HZ; Tong, H
2004-04-01
Source PublicationCHEMICAL ENGINEERING SCIENCE
ISSN0009-2509
Volume59Issue:8-9Pages:1897-1904
AbstractThe multi-scale methodology has been used as a conceptual tool in devising an apparatus for continuous processing of ultra-fine particles in the fluidized state. The apparatus combines a fast-bed riser with a conical dipleg into a circulating fluidized bed (CFB) loop. The micro-scale discrete ultra-fine particles gather together into meso-scale agglomerates on account of inter-particle forces, in both the fast-bed riser and the conical dipleg. In particular, in the latter, the fine particles are sufficiently entrapped because of reduced gas velocity in the top region, into the top-to-bottom and center-to-periphery mixing currents of the solids, to form agglomerates before being recycled to the bottom of the fast-bed riser. The fast-bed riser, because of its high and relatively uniform gas velocity, serves to adjust the size, especially the size distribution of the agglomerates, that is, further capture of discrete micro-scale discrete particles for the smaller agglomerates to make them larger, and attrition of over-size agglomerates to make them smaller. Uniform agglomerates of a given average size ensures stable fluidization, minimizing the danger of deposition of macro-scale lumps of agglomerates to lead to blockage as well as defluidization elsewhere in the loop. The above concept is shown experimentally operable using 4 kinds of ultra-fine particles: calcium carbonate. titanium dioxide, silicon dioxide and saponite. (C) 2004 Elsevier Ltd. All rights reserved.; The multi-scale methodology has been used as a conceptual tool in devising an apparatus for continuous processing of ultra-fine particles in the fluidized state. The apparatus combines a fast-bed riser with a conical dipleg into a circulating fluidized bed (CFB) loop. The micro-scale discrete ultra-fine particles gather together into meso-scale agglomerates on account of inter-particle forces, in both the fast-bed riser and the conical dipleg. In particular, in the latter, the fine particles are sufficiently entrapped because of reduced gas velocity in the top region, into the top-to-bottom and center-to-periphery mixing currents of the solids, to form agglomerates before being recycled to the bottom of the fast-bed riser. The fast-bed riser, because of its high and relatively uniform gas velocity, serves to adjust the size, especially the size distribution of the agglomerates, that is, further capture of discrete micro-scale discrete particles for the smaller agglomerates to make them larger, and attrition of over-size agglomerates to make them smaller. Uniform agglomerates of a given average size ensures stable fluidization, minimizing the danger of deposition of macro-scale lumps of agglomerates to lead to blockage as well as defluidization elsewhere in the loop. The above concept is shown experimentally operable using 4 kinds of ultra-fine particles: calcium carbonate. titanium dioxide, silicon dioxide and saponite. (C) 2004 Elsevier Ltd. All rights reserved.
KeywordFluidization Ultrafine Powders Agglomerate Multi-scale Structure Powder Technology
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
URL查看原文
Indexed BySCI
Language英语
WOS KeywordFORCES
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000221628600025
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/4966
Collection研究所(批量导入)
AffiliationChinese Acad Sci, Inst Proc Engn, Multiphase React Lab, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Li, HZ,Tong, H. Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop[J]. CHEMICAL ENGINEERING SCIENCE,2004,59(8-9):1897-1904.
APA Li, HZ,&Tong, H.(2004).Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop.CHEMICAL ENGINEERING SCIENCE,59(8-9),1897-1904.
MLA Li, HZ,et al."Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop".CHEMICAL ENGINEERING SCIENCE 59.8-9(2004):1897-1904.
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